MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA256f99348cc23be6daa13e53d1c615523ac0daa808d3064b2c954c3764e170cac2a
MD5dbc57cf15b17759dd8cb088785acabcf
File Typevbs
Size111.2 KB
First Seen2025-06-18
File NameMT103 Swift Copy.VBS
TagsMassLogger, vbs

Malware Family: MassLogger

MassLogger, email keylogger'dır.

TypeInfostealer
Programming LanguageC#/.NET
Target PlatformWindows
C2 ProtocolSMTP/FTP
PurposeEmail keylogger
First Seen Year2020

Threat Indicators (IOC)

  • SHA256: f99348cc23be6daa13e53d1c615523ac0daa808d3064b2c954c3764e170cac2a
  • MD5: dbc57cf15b17759dd8cb088785acabcf

You can verify all hash values of this sample on VirusTotal.

System Cleanup Guide

  1. Disconnect the system from the network immediately
  2. Yeni bir cihazdan banka hesabı, sosyal medya ve e-posta şifrelerini değiştirin
  3. Move crypto wallets to a new address and abandon the old ones
  4. Start a full scan with up-to-date antivirus
  5. Clear saved browser passwords and enable 2FA
  6. Sign out of all sessions on every affected service

YARA Rule Hints

rule MassLogger_SHA256 {
    meta:
        description = "MassLogger sample: f99348cc23be6daa"
        threat_level = "medium"
        first_seen = "2025-06-18"
    condition:
        hash.sha256(0, filesize) == "f99348cc23be6daa13e53d1c615523ac0daa808d3064b2c954c3764e170cac2a"
}

MassLogger — Malware Profile

MassLogger credential stealer. PT2600000043.js Portekiz fatura lurü. CommonJS obfuscation. dispatch configuration data.

Malware Type
Infostealer
Programming Language
C#/.NET
C2 Protocol
SMTP/FTP
Target Systems
Windows

Capabilities & Behavior

Tarayıcı Kimlik Bilgileri
Çerez Hırsızlığı
Kripto Cüzdan Çalma
Sistem Bilgisi
Ekran Görüntüsü
FTP/SSH İstemci Şifreleri
E-posta İstemcisi Çalma
Veri Sızıntısı

IOC List (2 indicators)

IOC — MassLogger
# SHA256 f99348cc23be6daa13e53d1c615523ac0daa808d3064b2c954c3764e170cac2a # MD5 dbc57cf15b17759dd8cb088785acabcf
TypeValueNote
sha256 f99348cc23be6daa13e53d1c615523ac0daa808d3064b2c954c3764e170cac2a Sample:MassLogger
md5 dbc57cf15b17759dd8cb088785acabcf Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi